 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.internal.core;


 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.NullProgressMonitor;
 import org.eclipse.core.runtime.OperationCanceledException;
 import org.eclipse.core.runtime.SubProgressMonitor;

 public class Policy {
     /**
      * Progress monitor helpers
      */
     public static void checkCanceled(IProgressMonitor monitor) {
         if (monitor.isCanceled())
             throw new OperationCanceledException();
     }
     public static IProgressMonitor monitorFor(IProgressMonitor monitor) {
         if (monitor == null)
             return new NullProgressMonitor();
         return monitor;
     }
     
     public static IProgressMonitor subMonitorFor(IProgressMonitor monitor, int ticks) {
         if (monitor == null)
             return new NullProgressMonitor();
         if (monitor instanceof NullProgressMonitor)
             return monitor;
         return new SubProgressMonitor(monitor, ticks);
     }
 }

